I have been using the cheap Laguna air pumps in my pond for winter and they are fine but the cost just keeps going up and I feel they are a little pricey now. I believe I paid a little over $30 and now they are at $50. I needed to replace one so I decided to get a better system. I decided to go with the Airmax KoiAir1 single plate aeration kit. Very easy to install and pleased with the output. Had one leak come out the fitting but that was a easy fix with a clamp. Seems like quality material even including the hose. The air stone to the left is the older system, the Airmax is on the right. Should keep the ice open very nicely. here is the pond the Airmax is right in front of the skimmer. Super cold today and the pond is getting a little ice on it now. First ice of the season. Stream has no ice at all but that should change tonight.